Spark-plug gasket



Patented Jan. 20, 1931 'The present'inventionrelatesltogimprovments ingaskets.- and; resides Vparticularly,in v4the provision of animproved'sparkglplug gasket which 1 isV preferably formed entirely of sheetmetal:

vvIt is onefofvv present inventio'nito'` providefa spark-.plug

gasket preferably entirely' metallic,fi-fand capable of I convenientAdistortion thereof vWithout fracture gtocon'form lto-irreg'.ularilties-inthe procelainfcoresorzin 'the metal casing #and `retainingvY-nutfifo'f; vsparkfplugsandy to therebyformv a better seal;

Y Another: obj ect yof .f the presentv yinvention resides-inthe.provision of aspark plug gas# Fketl formed entirely.cof"a metal sheet,Athe fus'ual asbestos giillerg; orfeore". commonly employed in gaskets ofthis typeybeing eliminated-.1.-. f It is aA furtherzrobj ect of thepresentI invenl plugs ha/ving. f a iz hollow 'core which' permits ftli'ef 1Qas'k`et lto assume j'any-fdesired shape Y as defined by the contourof the'. metal. oasing, retaining nut,'or pm'cela'in`v core of ay sparklf 1 Still-another object-'hof this invention 1s to provide a spark'plugg'a'sket which is veflcient o in use, `simple-fin --cons'tructionJfandeinexpen- *304 A, j

f" The foregoingaiidsuchfother objects-and v p A "become" apparentasfthe description?!:proceeds tvill `be more' 'readilyrsiyetomanufacture; 1 if understood'f-rom th'e'following 'sIl iecifclat,ion,`reference "be'rls h' 10. the afccomp'yng drawings; injyhich.

Fig. 1 is jasecti spark plug n employing fthe gaskets vof v thisinyention.,- rg@ Fig@ 2 nis- ,aperspective'y yiew of .the imfv.provedspark plugrgasket.

Fig.:` Sis Aa .central sectlonal yiewithrough the coreof the"improvedgasketl j,

- -Fig; 4=is asectionalfviewsimilai tolig. 3,

@showin i Fig. spark pl ti n fito. yprov-ide a'knovel. :gasketv for;spark onal' elevational'yiew offa Fig. 5 iran; enlargedamrticalysectionaly View' jthrough a fragment-f' oflfthe Vimprc'wed gasketbefore'- the :enveloping/shell is .rolled v50 l over they corea Fig. 61s a similar Vertical sectional;View7 g of a: portion `oiza lspark pluggasket.shov'v'ing the complete assemblythereof, taken' online Fig.ymisvaverui "se'cfinaiview {simi-lar ggasketa-@a n f v`Graske't'sfofknown construction employed inf spark plugs are commonly provided with4an 60=- n l asbestos-diller, or if'forinediofone piece,` are fusuall'yofl'solid construction,- Which lconstruektion prohibits vafleinlateflexing or other dips-v tortion'ofthe gasketsto conformtoztherporee- I ilain core of the` sparkv plugl or,to1 the shell-for 65 'i With theimproved-spark pluglgasket, i trated'infthe .accompanying drawing;l thevpro-n visiimfof av novel .hollowv core apermits ready flexing of 'saidgaske'wherebythe latter may7 v70.* c onformgor adj ust; itseli to` anyirregularities present sin, the porcelain cor'eor otherycontiguous-*Parts oftheeSPk Plug- Referring to the drawing,fthenoyelfspark plug gasket-consists of, anzoutei' yenvelopmg 75 shell11 pressed or otherwise formed from a annu-lar ring, lformedsubstantiallygUfsha'ped 1 in `cross section,A haying the. *bottoml12,'a1r1d" ninncr and 'outer side-'Walls 13 .andylfl substan-BQ tiallyperpendicular ;to the bottom 12." An ff annular corefl is adapted tb bereceived 1 vithin this channelshafped shell 11,'said core' alsobeingforniedof a metal sheet to assume a` v substantially triangularcross section having` 85 its annularedges abutting at the apexofQ-thetriangle, as at 16. Theside 1 7 ofl the trianggu-y o :lara-core,opposite the `apexnvis preferably l' i yformed'arcuate inshapel .f f

The core 15 is placed within the shellll p y g lftheenvelopiiii;shell'fof tlegasket i priorfto tli'e'insertion ofthe'core.

.Gushowingfa modiliedsform of the y S ark plug gaskets of this type arepar-v ticu arly adapted for use in spark plugs of the type illustratedat18 in Fig. 1. A's shown,

v two gaskets are inserted in' each spark plug, i say. in the form shownin Fig. 6, one being held between the annular inner seat 19of the shell"21 of the spark plug andthe comple# mental annular seat 22 oftheporcelain core 23. The other gasket is placed upon the annular outerseat 24 of the porcelain core and a retaining nut 25 is threaded intothe `Shell 21 which nut contacts with and impinges upon said uppergasket. When the nut- 25 is tightened a pressure is exerted uponr thegaskets perpendicular thereof tending to flatten or otherwise distortsame. Insome instances the distortion may be, if desired, so great as tobring the gaskets tosubstantially the'shape seen in Fig.

The provision of fthe hollow core15 in the gaskets affords convenientdistortion thereof without fracture to conform to any irre laritieswhich may be present inthe seating surfaces22 and 24 of the orcelaincore 23. The ability of the improve lgasket to distort and thus conformto the'tibregularities of the seating surfaces insus ra perfectV sealingof the joints. Assaid gasket is compressed the Side walls 13 and 14 areurfred inwardly and outwardly respectivelyto abut the side walls of theporcelain core 23 and the shell 21,"the

4,triangular core acting as a filler and otherwise as a reinforcement todistribute, ressuresevenly ontliev seahng portions o the vgasketandtlius prevent fracture thereof.

While cores having various cross'sectional areas may be employed, itishighly preferable that the triangular cross section type be employed, asthe gasket is considerably strengthened thereby and will, therefore, re-

tainits shape under normal conditionsk con' siderable pressurelbeing'required to distort same. ,Y 1

`However', if desired agasket of the type such as shown in Figure 7 ma\be employed with similar results. In this orm ofthe i`n` vention thecore 27 thereof is preferably folded over upon itself andabutting atlsub-i formed ofa metal sheet having its edges thereof will permit lalimited amount of ilex- The enveloping shell 28 employed in this form issimilar in cross section to the core 27, this being formed ofk a metalsheet having its edges folded over and around the core 27 until itsedges abut, as at 29.

A gasket of this type will'retain a limited c amount of iiexibilitywhich will permit distortion thereof to allow said gasket to conform tothe irregularities of the seating surfaces 22 and 24 of the porcelaincore 23.

While there are numerous benetsobtainable by employingy the *novel sparkplug gaskets described herein, the principal advantage residesr in theabilitvfof the improved kspark plug gasketto conform to distortedseating surfaces, thus compensating for the irregularities in theseating surfaces of the porcelain and thereby preventing injury thereto.l n

While the preferred forms of the invention have been shown and describedin the foregoing, it is to be understood that the improved spark pluggasketsfherein disclosed are ca able of'embodying various modiiica-.tions 1n detail structure without departing from the spirit oftheinvention, no r the scope of the appendedclaims.

I claim: 1 l

l 1. A spark lug gasket having, in com-y bination, a split kmetalliccore and a split shell-envelo ing said core, the seams lofthe coreandshe l being rdisposed .at'non-adjacent points. -v 1 f .f

2. A spark plug asket having, in combination, a split hol ow metalliccore and a split shell envelo ing said core, the seams of'.l the coreand shel bination, a metallic core of substantially triannular-shapedcross section surrounded by` a shell of krectan ular'-cross section. a f

5. A spark p u y bination,v a meta ic core of` su antia-lly trianular-shaped cross-section enveloped by a she 1 enga'ng itsbase and apexonly.

6. A spar yplug gasket having," in ,combination, a metallic core ofsubstantially triar'gular cross section formeddarcuate at the si eopposite the apex thereof, a shell enveloping said core and engaging thearcuate surface and apex thereof on y. V

` 7. A spark plug gasket having, in com?` bination, a hol ow metallic'core of substantially triangular cross section, with the walls thereofat its apex'normally spaced apart and a shell of polygonalk crosssection enveloping said core, the core and shell having seams positionedat remote points from each other.

gasket having, in com-

